Antepenult
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In linguistics, the antepenult is the antepenultimate syllable of a word (e.g. "-dic-" is the antepenult of "per-pen-dic-ul-ar"). The antepenult precedes the penult or second-to-last syllable which, in turn, precedes the ultimate or final syllable.
In other words, third to last syllable of a word.